在Young [1] 論文中，曾用Galerkin法來解矩形膜的振動問題；在三項和六項趨近解中，曲線改變方向的現象都會發生。結果顯示，使用越多項趨近解時，兩條改變方向的曲線間的差距也就越小，如果使用無窮多項趨近解，則此兩條曲線將交會。本篇論文將用有限差分法來探討相同的問題，即是否用有限差分法亦會造成曲線改變方向的現象產生。 The Galerkin method was employed in the solution of the rectangular membrane vibration problem by Young [1]. In both three-term and six-term solutions, the curve veering phenomena did take place. As the results show, the more terms are used, the narrower
